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The grill in front of the furnace is 31"x63". The space housing the furnace & water heater that was panelled over is 63"x68". Last night, it started blowing cold, so I cut the power to the furnace...

My mom's Trane XL80 is blowing cold air. Not always, just sometimes. The first serviceman said it was a dirty filter. So, the filter was changed, and it started happening again. The second serviceman...